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XenForo released fixes in version 2.3.7 for two newly disclosed vulnerabilities affecting earlier versions of the forum platform. The more severe issue, tracked as CVE-2025-71279, is a CWE-287 authentication weakness involving passkeys added to user accounts that could allow an unauthenticated remote attacker to compromise passkey-based authentication. The flaw carries a CVSS 3.1 rating of AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating high impact across confidentiality, integrity, and availability.
A second flaw, CVE-2025-71282, is a CWE-209 information disclosure bug that can expose filesystem paths through exception messages triggered by open_basedir restrictions. That issue affects XenForo versions before 2.3.7 and could help attackers map a server's directory structure, with a CVSS 3.1 vector of AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Advisory references and the XenForo release notice indicate that upgrading to 2.3.7 addresses both vulnerabilities.
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3 events from the most recent confirmed update back to the earliest known activity.
A CVE entry was published for a XenForo information disclosure flaw in versions before 2.3.7 that could reveal filesystem paths through open_basedir exception messages. The issue was classified as CWE-209 and described as a network-accessible confidentiality-impacting vulnerability.
A CVE entry was recorded for a XenForo vulnerability affecting passkeys on user accounts in versions before 2.3.7. The issue was classified as CWE-287 and described as a remotely exploitable authentication-related flaw with high impact.
XenForo released version 2.3.7, and the release notice indicated it included fixes for security issues later tracked as CVE-2025-71279 and CVE-2025-71282 affecting versions before 2.3.7.
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XenForo disclosed and patched three high-severity vulnerabilities affecting multiple 2.2 and 2.3 releases, including **remote code execution**, **OAuth2 authorization abuse**, and a **template method call restriction bypass**. The most severe issue, `CVE-2026-35056`, allows an authenticated but malicious administrator with admin control panel access to execute arbitrary code on the server, affecting versions before **2.3.9** and **2.2.18**. The flaw is classified as `CWE-94` and carries a high-impact CVSS vector indicating compromise of confidentiality, integrity, and availability. Two additional XenForo flaws affect authorization controls in the platform. `CVE-2025-71278` impacts versions before **2.3.5** and allows OAuth2 client applications to request unauthorized scopes, potentially granting access beyond intended permissions; it is mapped to `CWE-863`. `CVE-2025-71281` affects versions before **2.3.7** and stems from a loose prefix match in template callback and variable method-call handling, enabling unauthorized method invocation from templates. XenForo addressed the issues in security releases **2.3.5**, **2.3.7**, **2.3.9**, and **2.2.18**, with advisories also published by VulnCheck.
Jun 29, 2026
Xen has disclosed two Linux guest kernel vulnerabilities affecting virtualized environments, warning that both issues require patching and have no known mitigations. **CVE-2026-31786** (`XSA-485`) affects Linux kernels **4.13 and later** in Xen domains through unsafe handling of the binary build ID exposed at `/sys/hypervisor/properties/buildid`. The bug uses `sprintf()` on a non-null-terminated binary value, which can trigger an out-of-bounds read and, in rare cases, a write past the 4 KB sysfs buffer, potentially leading to **information disclosure, denial of service, or privilege escalation** inside Linux Xen guests. A second advisory, **CVE-2026-31787** (`XSA-487`), describes a **double-free** flaw in the Linux **Xen `privcmd` driver** that allows a **root user in a Linux guest** to bypass kernel lockdown protections tied to secure boot. Xen said the issue affects Linux **PVH or HVM domains** on **x86 and Arm** from kernel **3.8 onward**, while PV domains and non-Linux guests are not affected. The vulnerabilities were reported by **Frediano Ziglio of XenServer** and **Atharva Vartak (@0xAth4rv)**, respectively, and Xen urged operators to apply the supplied Linux patches.
Jun 29, 2026
Researchers detailed how attackers can abuse improperly exposed "protected" method handling in vBulletin to achieve unauthenticated remote code execution on internet-facing forums. The issue affects vBulletin `5.0.0` through `5.7.5` and `6.0.0` through `6.0.3` running on PHP `8.1` or newer, and is tracked as **CVE-2025-48827** and **CVE-2025-48828**. Technical analysis showed the flaws can be chained from remote access to protected method invocation and full code execution on vulnerable servers. CSIRT.SK reported the vulnerabilities are being actively exploited in the wild, with abuse observed since at least May 2025, while many exposed instances remain unpatched. The vendor had reportedly released fixes in April 2024 without detailed public disclosure, leaving administrators unaware of the severity until later reporting. Defenders are being urged to update affected installations to the recommended patched versions or the latest release and to review server and application logs for evidence of compromise.
Jul 24, 2026